Comparison between acoustic radiation force impulse quantification data and perfusion-CT parameters in hepatocellular...

Area of Science:

• Hepatobiliary imaging
• Medical ultrasonography
• Oncologic imaging

Background:

• Hepatocellular carcinoma (HCC) is a primary liver malignancy.
• Accurate tumor characterization is crucial for treatment planning.
• Ultrasound elastography offers a non-invasive method to assess tissue stiffness.

Purpose of the Study:

• To investigate the correlation between ultrasound elastography findings and tumor perfusion patterns in HCC.
• To determine if tissue elasticity can predict vascularity in HCC using volume perfusion computed tomography (VPCT).

Main Methods:

• 25 patients with suspected HCC underwent VPCT and acoustic radiation force impulse (ARFI) elastography.
• Quantitative elasticity values, blood flow (BF), blood volume (BV), and hepatic perfusion index (HPI) were calculated.
• Histologic grading, lesion size, and location were also analyzed.

Main Results:

• No significant linear correlation was found between HCC elasticity and BF, BV, or HPI.
• Higher elasticity values correlated with larger tumor size (p=0.008).
• Shear wave velocity decreased with greater distance to the skin surface (p=0.028) and varied by liver segment.

Conclusions:

• Tissue elasticity in HCC does not correlate with tumor vascularization.
• Tumor size and intrahepatic localization significantly influence measured elasticity values.
• Ultrasound elastography provides insights into HCC characteristics beyond vascularity.